Finding the Fourth Proportional to 964.72, 1,443.84 and 856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   964.72 : 1,443.84 = 856.72 : x
2. Step 2: Convert to fraction form
   964.72/1,443.84 = 856.72/x
3. Step 3: Cross multiply
   964.72x = 1,443.84 × 856.72
4. Step 4: Simplify right side
   964.72x = 1,236,966.60
5. Step 5: Solve for x
   x = 1,236,966.60/964.72
6. Step 6: Final answer
   x = 1,282.20